package guide;

import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.IncorrectCredentialsException;
import org.apache.shiro.authc.LockedAccountException;
import org.apache.shiro.authc.UnknownAccountException;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.config.IniSecurityManagerFactory;
import org.apache.shiro.mgt.SecurityManager;
import org.apache.shiro.session.Session;
import org.apache.shiro.subject.Subject;
import org.apache.shiro.util.Factory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

// https://github.com/apache/shiro/blob/master/samples/quickstart/src/main/java/Quickstart.java
public class Quickstart {

	 private static final transient Logger log = LoggerFactory.getLogger(Quickstart.class);


	    public static void main(String[] args) {

	        // The easiest way to create a Shiro SecurityManager with configured
	        // realms, users, roles and permissions is to use the simple INI config.
	        // We'll do that by using a factory that can ingest a .ini file and
	        // return a SecurityManager instance:

	        // Use the shiro.ini file at the root of the classpath
	        // (file: and url: prefixes load from files and urls respectively):
	        Factory<SecurityManager> factory = new IniSecurityManagerFactory("classpath:shiro2.ini");
	        SecurityManager securityManager = factory.getInstance();

	        // for this simple example quickstart, make the SecurityManager
	        // accessible as a JVM singleton.  Most applications wouldn't do this
	        // and instead rely on their container configuration or web.xml for
	        // webapps.  That is outside the scope of this simple quickstart, so
	        // we'll just do the bare minimum so you can continue to get a feel
	        // for things.
	        SecurityUtils.setSecurityManager(securityManager);

	        // Now that a simple Shiro environment is set up, let's see what you can do:

	        // get the currently executing user:
	        Subject currentUser = SecurityUtils.getSubject();

	        // Do some stuff with a Session (no need for a web or EJB container!!!)
	        Session session = currentUser.getSession();
	        session.setAttribute("someKey", "aValue");
	        String value = (String) session.getAttribute("someKey");
	        if (value.equals("aValue")) {
	            log.info("Retrieved the correct value! [" + value + "]");
	        }

	        // let's login the current user so we can check against roles and permissions:
	        if (!currentUser.isAuthenticated()) {
	            UsernamePasswordToken token = new UsernamePasswordToken("lonestarr", "vespa");
	            token.setRememberMe(true);
	            try {
	                currentUser.login(token);
	            } catch (UnknownAccountException uae) {
	                log.info("There is no user with username of " + token.getPrincipal());
	            } catch (IncorrectCredentialsException ice) {
	                log.info("Password for account " + token.getPrincipal() + " was incorrect!");
	            } catch (LockedAccountException lae) {
	                log.info("The account for username " + token.getPrincipal() + " is locked.  " +
	                        "Please contact your administrator to unlock it.");
	            }
	            // ... catch more exceptions here (maybe custom ones specific to your application?
	            catch (AuthenticationException ae) {
	                //unexpected condition?  error?
	            }
	        }

	        //say who they are:
	        //print their identifying principal (in this case, a username):
	        log.info("User [" + currentUser.getPrincipal() + "] logged in successfully.");

	        //test a role:
	        if (currentUser.hasRole("schwartz")) {
	            log.info("May the Schwartz be with you!");
	        } else {
	            log.info("Hello, mere mortal.");
	        }

	        //test a typed permission (not instance-level)
	        if (currentUser.isPermitted("lightsaber:wield")) {
	            log.info("You may use a lightsaber ring.  Use it wisely.");
	        } else {
	            log.info("Sorry, lightsaber rings are for schwartz masters only.");
	        }

	        //a (very powerful) Instance Level permission:
	        if (currentUser.isPermitted("winnebago:drive:eagle5")) {
	            log.info("You are permitted to 'drive' the winnebago with license plate (id) 'eagle5'.  " +
	                    "Here are the keys - have fun!");
	        } else {
	            log.info("Sorry, you aren't allowed to drive the 'eagle5' winnebago!");
	        }

	        //all done - log out!
	        currentUser.logout();

	        System.exit(0);
	    }

}
